<!-- 
  * t
  ****************************************************************************
  * Copyright (c) 1998-2008,2010 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
  * "Software"), to deal in the Software without restriction, including      *
  * without limitation the rights to use, copy, modify, merge, publish,      *
  * distribute, distribute with modifications, sublicense, and/or sell       *
  * copies of the Software, and to permit persons to whom the Software is    *
  * furnished to do so, subject to the following conditions:                 *
  *                                                                          *
  * The above copyright notice and this permission notice shall be included  *
  * in all copies or substantial portions of the Software.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************
  * @Id: form_field_buffer.3x,v 1.19 2010/12/04 18:38:55 tom Exp @
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="generator" content="Manpage converted by man2html - see http://invisible-island.net/scripts/readme.html#others_scripts">
<TITLE>form_field_buffer 3x</TITLE>
<link rev=made href="mailto:bug-ncurses@gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<H1 class="no-header">form_field_buffer 3x</H1>
<PRE>
<STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>                             <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>




</PRE>
<H2><a name="h2-NAME">NAME</a></H2><PRE>
       <STRONG>form_field_buffer</STRONG> - field buffer control


</PRE>
<H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>

       int  set_field_buffer(FIELD  *field,  int  buf, const char
       *value);
       char *field_buffer(const FIELD *field, int buffer);
       int set_field_status(FIELD *field, bool status);
       bool field_status(const FIELD *field);
       int set_max_field(FIELD *field, int max);


</PRE>
<H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
       The function <STRONG>set_field_buffer</STRONG> sets the numbered buffer  of
       the given field to contain a given string:

          <STRONG>o</STRONG>   Buffer 0 is the displayed value of the field.

          <STRONG>o</STRONG>   Other numbered buffers may be allocated by applica-
              tions   through   the   <STRONG>nbuf</STRONG>   argument   of   (see
              <STRONG><A HREF="form_field_new.3x.html">form_field_new(3x)</A></STRONG>)  but are not manipulated by the
              forms library.

       The function <STRONG>field_buffer</STRONG> returns a pointer  to  the  con-
       tents of the given numbered buffer:

          <STRONG>o</STRONG>   The  buffer  contents  always have the same length,
              and are padded with trailing spaces  as  needed  to
              ensure this length is the same.

          <STRONG>o</STRONG>   The buffer may contain leading spaces, depending on
              how it was set.

          <STRONG>o</STRONG>   The buffer contents are set with  <STRONG>set_field_buffer</STRONG>,
              or  as  a  side effect of any editing operations on
              the corresponding field.

          <STRONG>o</STRONG>   Editing operations are based on  the  <EM>window</EM>  which
              displays the field, rather than a <EM>string</EM>.  The win-
              dow contains  only  printable  characters,  and  is
              filled  with blanks.  If you want the raw data, you
              must write your own routine that copies  the  value
              out  of  the  buffer  and  removes  the leading and
              trailing spaces.

          <STRONG>o</STRONG>   Because editing operations change  the  content  of
              the  buffer to correspond to the window, you should
              not rely on using buffers for long-term storage  of
              form data.

       The  function  <STRONG>set_field_status</STRONG> sets the associated status
       flag of <EM>field</EM>; <STRONG>field_status</STRONG> gets the current  value.   The
       status  flag  is set to a nonzero value whenever the field
       changes.

       The function <STRONG>set_max_field</STRONG> sets the  maximum  size  for  a
       dynamic  field.   An  argument  of 0 turns off any maximum
       size threshold for that field.


</PRE>
<H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
       The <STRONG>field_buffer</STRONG> function returns NULL on error.  It  sets
       errno according to their success:

       <STRONG>E_OK</STRONG> The routine succeeded.

       <STRONG>E_BAD_ARGUMENT</STRONG>
            Routine  detected  an incorrect or out-of-range argu-
            ment.

       The <STRONG>field_status</STRONG> function returns <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.

       The remaining routines return one of the following:

       <STRONG>E_OK</STRONG> The routine succeeded.

       <STRONG>E_SYSTEM_ERROR</STRONG>
            System error occurred (see <STRONG>errno</STRONG>).

       <STRONG>E_BAD_ARGUMENT</STRONG>
            Routine detected an incorrect or  out-of-range  argu-
            ment.


</PRE>
<H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> and related pages whose names begin "form_" for
       detailed descriptions of the entry points.


</PRE>
<H2><a name="h2-NOTES">NOTES</a></H2><PRE>
       The header file <STRONG>&lt;form.h&gt;</STRONG> automatically includes the header
       file

       When  configured for wide characters, <STRONG>field_buffer</STRONG> returns
       a pointer to temporary storage (allocated and freed by the
       library).   The  application  should not attempt to modify
       the data.  It will be freed on the next call to <STRONG>field_buf-</STRONG>
       <STRONG>fer</STRONG> to return the same buffer.  <STRONG>&lt;curses.h&gt;</STRONG>.


</PRE>
<H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
       These  routines  emulate the System V forms library.  They
       were not supported on Version 7 or BSD versions.


</PRE>
<H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
       Juergen Pfeifer.  Manual  pages  and  adaptation  for  new
       curses by Eric S. Raymond.



                                                  <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-AUTHORS">AUTHORS</a></li>
</ul>
</div>
</BODY>
</HTML>
